Daniel John Erlandsson (born 22 May 1976) is a Swedish musician, best known as the drummer in the melodic death metal band Arch Enemy and as former drummer of extreme metal bands Carcass and Brujeria.
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c87d3959c6d6918d6403074165954f4362b2c40bf3065537422393dffcc7799. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea48c53d-2bb1-4bd6-a359-cf43f17f5505.json and https://artists.proofprofile.net/proofs/artist/ea48c53d-2bb1-4bd6-a359-cf43f17f5505.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.